M&S says

Our soft t-shirt bra is the perfect choice for those seeking a bit of luxury under their clothes. Available in sizes A-DD, the Velvet Touch™ feels smooth and silky against your skin, while the Light As Air™ technology makes the fabric breathable. The added stretch and underwire give you support and lift for ultimate confidence. Featuring a playful bow, our gorgeous padded bra helps give you the best possible shape.